Via security expert Bruce Schneier, the AP reports that police in central Connecticut obtained an arrest warrant partially on the timing of a murder victim's Fitbit step data:
Connecticut State Police allege [Richard] Dabate killed 39-year-old Connie Dabate at their Ellington home two days before Christmas in 2015, while their two young sons were in school.
Dabate told investigators a masked man shot his wife and tied him up before he burned the intruder with a torch. Authorities responded to a burglary alarm at the home and found Richard Dabate with superficial knife wounds, with one arm and one leg zip-tied to a folding chair.
But police said evidence contradicted Dabate's story and timeline of events, including information from Connie Dabate's Fitbit that showed she was still moving around the house an hour after Richard Dabate said she was shot.
Dabate pleaded not guilty to the crime. Also, the Fitibit data, while helpful to the police, may have had less impact than the allegation that "Dabate also told his pregnant girlfriend before the slaying that he was going to divorce his wife, state police said in an arrest warrant affidavit."
NBC has more.